package com.pdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.pdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

public class RefreshTokenInterceptor implements HandlerInterceptor {

    // 需要手动注入
    private StringRedisTemplate stringRedisTemplate;

    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate){
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 1.获取请求头中的token
        String token = request.getHeader("authorization");
        //HttpSession session = request.getSession();

        if(StrUtil.isBlank(token)){
            return true;
        }

        // 2.基于token获取redis中的用户
        String key = RedisConstants.LOGIN_USER_KEY + token;
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash().entries(key);

        // 3.判断用户是否存在
        if(userMap.isEmpty()){
            return true;
        }
        //Object userDTO = session.getAttribute("userDTO");

//        // 3.判断用户是否存在
//        if(userDTO == null){
//            // 4.不存在，拦截
//            response.setStatus(401);
//            return false;
//        }

        //5.将查询到的Hash数据转化为UserDTO对象
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);

        // 6.存在，保存用户信息到ThreadLocal
        UserHolder.saveUser((UserDTO)userDTO);

        // 7.刷新token有效期
        stringRedisTemplate.expire(key, RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);

        // 8.放行
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        UserHolder.removeUser();
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}
